“真空断路器”因其灭弧介质和灭弧后触头间隙的绝缘介质都是高真空而得名；其具有体积小、重量轻、适用于频繁操作、灭弧不用检修的优点，在配电网中应用较为普及。 真空断路器是3～10kV，50Hz三相交流系统中的户内配电装置，可供工矿企业、发电厂、变电站中作为电器设备的保护和控制之用，特别适用于要求无油化、少检修及频繁操作的使用场所，断路器可配置在中置柜、双层柜、固定柜中作为控制和保护高压电气设备用。
"Vacuum circuit breaker" has its name because of its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing. It has the advantages of small size, light weight, suitable for frequent operation and arc extinguishing. It is widely used in distribution network. The vacuum circuit breaker is the indoor distribution device in the 3 ~ 10kV, 50Hz three-phase AC system, which can be used as the protection and control of the electrical equipment in the industrial and mining enterprises, power plants and substations. It is especially suitable for the use of no oil, less maintenance and frequent operation. The circuit breakers can be configured in a cabinet, a double deck cabinet, and a fixed cabinet. It is used as the control and protection of high voltage electrical equipment.